You should not be reaching for anything if police stops you until asked.
"Always be polite during traffic stops, even if the officer is aggressive. You have little to lose by being polite and a lot to lose by being belligerent. Roll down your window, turn off the engine and place your hands on the steering wheel. If it is night time, turn on your interior light. Do not reach for documentation: officers are trained to spot driver's reaching for hidden items, or stashing items, and it is likely an officer may misinterpret your actions. You might be reaching for your registration, but for all the officer knows, you're reaching for a gun."
http://traffic.findlaw.com/traffic-stops/what-to-do-during-traffic-stops.html